Aiee I'm too tough for you guys - I would take the food away after a few strikes, and take bub out of the highchair - dinner over. Then we might try for dinner take 2 30min later.

I know for the eldest (who is older than your bub), I find it works giving him just a bit of food at a time, so he knows it's a valuable commodity, and then he's less likely to chuck it about. Your bub could think completely differently there though.